package com.qk.filter;

import com.qk.common.utils.CurrentUserHoler;
import com.qk.common.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        //1.获取请求路径
        String uri = request.getRequestURI();
        //2.判断是否是登录请求
        if(uri.contains("/login")){
            log.info("登录请求");
            filterChain.doFilter(request, response);
            return;
        }
        //3.获取请求头中的token
        String jwt = request.getHeader("token");

        //4.判断token是否为空
        if(jwt == null ||jwt.isEmpty()){
            log.info("token为空");
            response.setStatus(401);
            return;
        }
        //5.解析token
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId =  claims.get("id", Integer.class);
            log.info("当前用户id为，存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.error("令牌解析失败");
            response.setStatus(401);
            return;
        }
        //6.放行
        log.info("令牌解析成功，放行");
        filterChain.doFilter(request, response);
        //7.释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();
    }
}
